I've been following this topic because I will probably buy one of this here in Portugal. Already tested it at the store and read a bit of the manual: about usb connection, the GW-7 is seen as an external device; midifiles, songs and styles can be dragged and dropped in to the keyboard's memory folders, seems as simple as that, that's what I understood by reading the manual. A really very important issue is the compatibility with Roland's styles, hope to hear good news!